Journal
ELECTROCHIMICA ACTA
Volume 258, Issue -, Pages 814-824Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.11.131
Keywords
Metal-ion batteries; Ion transfer kinetics; Potassium-ion intercalation; High voltage electrolytes
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Funding
- RFBR [16-33-60036 mol_a_dk]
- Russian Science Foundation [17-73-30006]
- Skoltech Center for Electrochemical Energy Storage and Lomonosov Moscow State University Program of Development
- [2016-1/NGP]
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Potassium and sodium-ion transfer kinetics were compared for the intercalation reactions into the KVPO4F positive electrode material in acetonitrile-and ethylene carbonate-based electrolytes, which implied the formation of different electrode/electrolyte interface structures. The presence of surface layers was found to result in a significantly more pronounced effect on the ion transfer kinetics for K+ compared with Na+, while the barrier layers in K+ electrolytes were demonstrated to be less resistive. Difficulties associated with the stabilization of the electrode material/potassium electrolyte interface under high operating potentials require the application of higher voltage electrolytes. The kinetic trends in three high voltage electrolytes were compared for the potassium (de) intercalation reaction, and the general obstacles to developing a high-voltage potassium-ion battery were identified. (C) 2017 Elsevier Ltd. All rights reserved.
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